package com.ls.controller;

import com.google.code.kaptcha.Producer;
import com.ls.entity.User;
import com.ls.service.UserService;
import com.ls.util.CommunityConstant;
import com.ls.util.CommunityUtil;
import com.ls.util.RedisKeyUtil;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.*;

import javax.imageio.ImageIO;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletResponse;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * @author ls
 **/
@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Value("${server.servlet.context-path}")
    private String contextPath;

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Autowired
    private RedisTemplate<String, Object> redisTemplate;

    @RequestMapping("/toRegister")
    public String toRegister() {
        return "/site/register";
    }

    @GetMapping("/login")
    public String toLogin() {
        return "/site/login";
    }

    /**
     * 注册
     *
     * @param model
     * @param user
     * @return
     */
    @PostMapping("/register")
    public String register(Model model, User user) {
        Map<String, Object> map = userService.register(user);
        if (map == null || map.isEmpty()) {
            model.addAttribute("msg", "注册成功，我们已经向您的邮箱发送了一封激活邮件，请尽快激活！");
            model.addAttribute("target", "/login");
            return "/site/operate-result";
        } else {
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            model.addAttribute("user", user);
            return "/site/register";
        }
    }


    /**
     * 用户激活 点击邮件激活链接 格式如下:
     * http://localhost/community/activation/101/code
     *
     * @param model
     * @param userId
     * @param code
     * @return
     */
    @RequestMapping(value = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code) {

        int result = userService.activation(userId, code);

        if (result == ACTIVATION_SUCCESS) {
            model.addAttribute("msg", "激活成功，您的账号已经可以正确使用了！");
            model.addAttribute("target", "/toLogin");
        } else if (result == ACTIVATION_REPEAT) {
            model.addAttribute("msg", "无效操作，该账号已经激活过了！");
            model.addAttribute("target", "/");
        } else {
            model.addAttribute("msg", "激活失败，您提供的激活码不正确！");
            model.addAttribute("target", "/");
        }

        return "/site/operate-result";
    }

    /**
     * 验证码
     *
     * @param response
     */
    @RequestMapping(value = "/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response/*, HttpSession session*/) {
        // 生成验证码
        String text = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(text);

        // 将验证码存入session
        // session.setAttribute("kaptcha", text);

        // 修改为 redis 缓存验证码
        // 验证码的归属者
        String kaptchaOwner = CommunityUtil.generateUUID();
        Cookie cookie = new Cookie("kaptchaOwner", kaptchaOwner);
        cookie.setMaxAge(60);
        cookie.setPath(contextPath);
        response.addCookie(cookie);
        // 将验证码存入redis
        String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
        redisTemplate.opsForValue().set(redisKey, text, 60, TimeUnit.SECONDS);

        response.setContentType("image/png");
        try {
            ServletOutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
        } catch (IOException e) {
            logger.error("响应验证码失败: {}", e.getMessage());
        }

    }

    /**
     * 登录功能
     *
     * @param username     用户名
     * @param password     密码
     * @param code         验证码
     * @param rememberMe   是否记住登录
     * @param model
     * @param response
     * @param kaptchaOwner 验证码拥有者
     * @return
     */
    @PostMapping("/login")
    public String login(String username,
                        String password,
                        String code,
                        boolean rememberMe, Model model,
            /*HttpSession session,*/
                        HttpServletResponse response,
                        @CookieValue(value = "kaptchaOwner", required = false) String kaptchaOwner) {
        // 检查验证码
        // String kaptcha = (String) session.getAttribute("kaptcha");
        // 修改为从redis中获取验证码
        String kaptcha = null;
        if (StringUtils.isNotBlank(kaptchaOwner)) {
            String redisKey = RedisKeyUtil.getKaptchaKey(kaptchaOwner);
            kaptcha = (String) redisTemplate.opsForValue().get(redisKey);
        }
        if (StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)) {
            model.addAttribute("codeMsg", "验证码不正确");
            return "/site/login";
        }

        // 检查账号，密码
        int expiredSeconds = rememberMe ? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);

        if (map.containsKey("ticket")) { // 登录成功
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/";
        } else { // 登录失败
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    /**
     * 退出登录
     *
     * @param ticket
     * @return
     */
    @GetMapping(path = "/logout")
    public String logout(@CookieValue("ticket") String ticket) {
        userService.logout(ticket);
        SecurityContextHolder.clearContext();
        return "redirect:/login";
    }

}
